Arm strength for QBs does not come from your arm. This is very suprising to many. It comes from your legs, hips, and core. Arm strength and putting distance/velocity on the ball is all about ground force and torque. You develop ground force from your legs and torque from your hips/core. These are 25 exercises in the weight room to work just that.

25 BEST Exercises To Improve Arm Strength